6592b9759c
This adds a new bus call to service and scope units called AttachProcesses() that moves arbitrary processes into the cgroup of the unit. The primary user for this new API is systemd itself: the systemd --user instance uses this call of the systemd --system instance to migrate processes if itself gets the request to migrate processes and the kernel refuses this due to access restrictions. The primary use-case of this is to make "systemd-run --scope --user …" invoked from user session scopes work correctly on pure cgroupsv2 environments. There, the kernel refuses to migrate processes between two unprivileged-owned cgroups unless the requestor as well as the ownership of the closest parent cgroup all match. This however is not the case between the session-XYZ.scope unit of a login session and the user@ABC.service of the systemd --user instance. The new logic always tries to move the processes on its own, but if that doesn't work when being the user manager, then the system manager is asked to do it instead. The new operation is relatively restrictive: it will only allow to move the processes like this if the caller is root, or the UID of the target unit, caller and process all match. Note that this means that unprivileged users cannot attach processes to scope units, as those do not have "owning" users (i.e. they have now User= field). Fixes: #3388
225 lines
7 KiB
C
225 lines
7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdbool.h>
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#include "cgroup-util.h"
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#include "ip-address-access.h"
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#include "list.h"
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#include "time-util.h"
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typedef struct CGroupContext CGroupContext;
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typedef struct CGroupDeviceAllow CGroupDeviceAllow;
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typedef struct CGroupIODeviceWeight CGroupIODeviceWeight;
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typedef struct CGroupIODeviceLimit CGroupIODeviceLimit;
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typedef struct CGroupBlockIODeviceWeight CGroupBlockIODeviceWeight;
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typedef struct CGroupBlockIODeviceBandwidth CGroupBlockIODeviceBandwidth;
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typedef enum CGroupDevicePolicy {
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/* When devices listed, will allow those, plus built-in ones,
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if none are listed will allow everything. */
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CGROUP_AUTO,
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/* Everything forbidden, except built-in ones and listed ones. */
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CGROUP_CLOSED,
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/* Everythings forbidden, except for the listed devices */
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CGROUP_STRICT,
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_CGROUP_DEVICE_POLICY_MAX,
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_CGROUP_DEVICE_POLICY_INVALID = -1
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} CGroupDevicePolicy;
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struct CGroupDeviceAllow {
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LIST_FIELDS(CGroupDeviceAllow, device_allow);
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char *path;
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bool r:1;
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bool w:1;
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bool m:1;
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};
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struct CGroupIODeviceWeight {
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LIST_FIELDS(CGroupIODeviceWeight, device_weights);
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char *path;
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uint64_t weight;
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};
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struct CGroupIODeviceLimit {
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LIST_FIELDS(CGroupIODeviceLimit, device_limits);
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char *path;
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uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
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};
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struct CGroupBlockIODeviceWeight {
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LIST_FIELDS(CGroupBlockIODeviceWeight, device_weights);
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char *path;
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uint64_t weight;
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};
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struct CGroupBlockIODeviceBandwidth {
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LIST_FIELDS(CGroupBlockIODeviceBandwidth, device_bandwidths);
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char *path;
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uint64_t rbps;
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uint64_t wbps;
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};
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struct CGroupContext {
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bool cpu_accounting;
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bool io_accounting;
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bool blockio_accounting;
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bool memory_accounting;
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bool tasks_accounting;
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bool ip_accounting;
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/* For unified hierarchy */
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uint64_t cpu_weight;
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uint64_t startup_cpu_weight;
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usec_t cpu_quota_per_sec_usec;
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uint64_t io_weight;
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uint64_t startup_io_weight;
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LIST_HEAD(CGroupIODeviceWeight, io_device_weights);
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LIST_HEAD(CGroupIODeviceLimit, io_device_limits);
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uint64_t memory_low;
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uint64_t memory_high;
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uint64_t memory_max;
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uint64_t memory_swap_max;
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LIST_HEAD(IPAddressAccessItem, ip_address_allow);
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LIST_HEAD(IPAddressAccessItem, ip_address_deny);
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/* For legacy hierarchies */
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uint64_t cpu_shares;
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uint64_t startup_cpu_shares;
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uint64_t blockio_weight;
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uint64_t startup_blockio_weight;
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LIST_HEAD(CGroupBlockIODeviceWeight, blockio_device_weights);
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LIST_HEAD(CGroupBlockIODeviceBandwidth, blockio_device_bandwidths);
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uint64_t memory_limit;
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CGroupDevicePolicy device_policy;
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LIST_HEAD(CGroupDeviceAllow, device_allow);
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/* Common */
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uint64_t tasks_max;
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bool delegate;
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CGroupMask delegate_controllers;
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};
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/* Used when querying IP accounting data */
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typedef enum CGroupIPAccountingMetric {
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CGROUP_IP_INGRESS_BYTES,
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CGROUP_IP_INGRESS_PACKETS,
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CGROUP_IP_EGRESS_BYTES,
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CGROUP_IP_EGRESS_PACKETS,
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_CGROUP_IP_ACCOUNTING_METRIC_MAX,
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_CGROUP_IP_ACCOUNTING_METRIC_INVALID = -1,
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} CGroupIPAccountingMetric;
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#include "unit.h"
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void cgroup_context_init(CGroupContext *c);
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void cgroup_context_done(CGroupContext *c);
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void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix);
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CGroupMask cgroup_context_get_mask(CGroupContext *c);
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void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a);
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void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w);
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void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l);
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void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w);
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void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b);
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CGroupMask unit_get_own_mask(Unit *u);
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CGroupMask unit_get_delegate_mask(Unit *u);
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CGroupMask unit_get_members_mask(Unit *u);
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CGroupMask unit_get_siblings_mask(Unit *u);
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CGroupMask unit_get_subtree_mask(Unit *u);
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CGroupMask unit_get_target_mask(Unit *u);
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CGroupMask unit_get_enable_mask(Unit *u);
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bool unit_get_needs_bpf(Unit *u);
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void unit_update_cgroup_members_masks(Unit *u);
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const char *unit_get_realized_cgroup_path(Unit *u, CGroupMask mask);
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char *unit_default_cgroup_path(Unit *u);
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int unit_set_cgroup_path(Unit *u, const char *path);
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int unit_pick_cgroup_path(Unit *u);
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int unit_realize_cgroup(Unit *u);
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void unit_release_cgroup(Unit *u);
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void unit_prune_cgroup(Unit *u);
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int unit_watch_cgroup(Unit *u);
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void unit_add_to_cgroup_empty_queue(Unit *u);
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int unit_attach_pids_to_cgroup(Unit *u, Set *pids, const char *suffix_path);
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int manager_setup_cgroup(Manager *m);
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void manager_shutdown_cgroup(Manager *m, bool delete);
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unsigned manager_dispatch_cgroup_realize_queue(Manager *m);
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Unit *manager_get_unit_by_cgroup(Manager *m, const char *cgroup);
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Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid);
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Unit* manager_get_unit_by_pid(Manager *m, pid_t pid);
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int unit_search_main_pid(Unit *u, pid_t *ret);
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int unit_watch_all_pids(Unit *u);
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int unit_synthesize_cgroup_empty_event(Unit *u);
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int unit_get_memory_current(Unit *u, uint64_t *ret);
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int unit_get_tasks_current(Unit *u, uint64_t *ret);
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int unit_get_cpu_usage(Unit *u, nsec_t *ret);
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int unit_get_ip_accounting(Unit *u, CGroupIPAccountingMetric metric, uint64_t *ret);
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int unit_reset_cpu_accounting(Unit *u);
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int unit_reset_ip_accounting(Unit *u);
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#define UNIT_CGROUP_BOOL(u, name) \
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({ \
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CGroupContext *cc = unit_get_cgroup_context(u); \
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cc ? cc->name : false; \
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})
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bool unit_has_root_cgroup(Unit *u);
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int manager_notify_cgroup_empty(Manager *m, const char *group);
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void unit_invalidate_cgroup(Unit *u, CGroupMask m);
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void unit_invalidate_cgroup_bpf(Unit *u);
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void manager_invalidate_startup_units(Manager *m);
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const char* cgroup_device_policy_to_string(CGroupDevicePolicy i) _const_;
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CGroupDevicePolicy cgroup_device_policy_from_string(const char *s) _pure_;
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bool unit_cgroup_delegate(Unit *u);
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